Helm mullbr



(No Model.)

GAR BRAKE.

Patented July 28 (No Model.) 2 Sheets- Sheet 2.v E. F. W. MULLER. y

GAR BRAKE.

No. 322,959. 4Patented'July 28, 1885. -4

' To all whom it may concern:

UNITED STATES ERNST FRIEDRICH WILHELM MLLER, OF BERLIN, GERMANY.

CAR-BRAKE.

SPECIFICATION forming part of Letters Patent Nv'o. 322,959, dated July28, 1885.

Application filed February 12, 1885. (No model.)

Be it known that I, ERNsT FRIEDR. WIL- HELM MLLER, of the city ofBerlin, Kingdom of Prussia, German Empire, have invented a new, anduseful Improvement in Brakes, of which the following is a specifica`tion.

The rapidly-acting brake to which this invention relates has for iisobject to enable vehicles, and more especially tramway and railway cars,to be rapidly stopped in cases of emergency where the usual brakes wouldnot act with sufficient promptness, without, lhowever, interfering withthe use of the brakes to be operated by hand. rlhe construction of thisbrake is such that-say on a tram-car-the driver may instantaneously stopthe car by throwing apawl of the brake device out of engagement by amovement of his foot. The said brake-gear may be so connected with abrakespindle or a brake-lever that the ordinary brake may be appliedindependently of the emergency-brake; or the vehicle may be partly orwholly stopped by the brake.

The construction of this brake is represented in the accompanyingdrawings, in which Figure l is an elevation showing this brake with anordinary hand-brake. Fig. 2 is an end View of Fig. l; Fig. 2, adisengaging mechanism for the rapidly-acting or emergency brake, Fig. 3,a plan of Fig. 1; Fig. 4, a modified forni of the invention shown inFigs. 1 to 3; Fig. 5, a modification of the construction shown in Fig.4, the brake-block acting from below; Fig. 5, a plan of Fig. 5.

This brake consists, substantially, of a brake-block, A, which, when thebrake-lever is released, falls upon the front and top part of theperiphery of the wheel, is driven forward by friction, and by a suitablearrangement of levers and connecting-rods causes the brake-block B veryrapidly and with great force to be pressed against the rear part of thewheel, thus stopping the vehicle. The dotted lines show the position ofthe levers, brakeblocks, and connecting-rods when the apparatus isreleased.

The falling brake-block A is suspended in the bearing E, suitably placedon the under side of the vehicle-body on a lever, C, as in Figs. 1, 2,3, or by a pair of levers, C202, Fig..

The cheeks of the brake-blocks B, which may be of beech, are fitted witha wroughtiron brake-shoe, b. A connecting-rod, F, Figs. l to 3, (or apair of such rods, F'l F, as shown in Fig. 5%) serves to connect thebrake-block A with the brake-block B, and the couplingrod f connects theblock A of one wheel, R, with the corresponding block of the secondwheel, R, in the saine pair, while a couplingrod, f', connects the blockB of one wheel, R, with the corresponding block of the other wheel, R,-of the pair.

By the pivoted link or rod G, Figs. l to 3, or by a pair of such links,G G', Fig. 5, connected with the coupling rod or rods f and hung onpivots h in bearings H, the brakeblocks B are suspended from the underside of the carriage.

At the center ofthe coupling-rodfthebrakechain K is attached. The chainpasses between k k and k It, and is connected with the operating bar orrod J, the latter receiving the end of the chain K.

The mechanism for working the brake may be v of any suitableconstruction. For tramcars it may be the following:

The operating-rod J has at the lower parta recess, i', with which thepawl i? engages. This rod is at the center of the front plate, L, of theplatform fl) of the car and held by straps, so as to be movable. Ashoulder or projection, i3, on the rod J limits the movementof thelatter.

To release the brake or to put it on, the driver pushes the pawl t2aside by means of his foot, and the weight of the blocks A A will causethe same to descend upon the wheel R R. In consequence of effect thebrake-blocks A A are driven forward by the wheels R R', together withthe lever C and bar D. The brake-blocks B B, impelled by theconnectingrods F F, together with the coupling-bars f f', follow thismotion, and thus are rapidly and forcibly applied to the wheels R R',whereby the car is stopped. If, now, the falling block is raised off thewheel by rod J and IOO chain K, then the blocks B B will by their ownweight and that of the rods G G fall away from the wheels R R. Thelength of the rods F F is so chosen that the brakes are rapidly put on;but no unpleasant or injuriousjar or concussion can take place. Withslight alteration this principle can be applied to railwaybrakes also.

The construction of this emergency-brake is such that it may be directlyconnected with a hand-brake spindle, so that either the blocks A and Bmay be simultaneously put on77 by one mechanism or the blocks B may beindependently applied. To this end it is only necessary to key or fastena lever, Z, on an extension, G', of the brake-bara of the brakeblocks B,and to actuate said lever, say, by a bell crank, m n, connected withbrake-operating mechanism B of the usual construction. Thus, instead ofthe double emergency-brake, t-he blocks B may be worked by themselves bydrawing the same against the wheels B B by the aid of the rodZand partsconnected therewith. In the same manner the emergencybrake device can beput into operation by releasing the lever J. The chain O between thebrake-spindle B and the rod Z will not transmit the motion of thebrake-blocks to the spindle B; or7 even in the case, while applying thehand-brake, it should be found that more rapid action is required forarresting the vehicle in time, it will only be requisite to release thefalling blocks A to cause quick action, as above explained.

In Figs. 4, 5, and 5n is shown a modification of the rod-connectionsforthe brake illustrated in Figs. l to 3, means being shown for workingthe falling brake-block either from above or from below.

The connecting-rod Fis not directly connected with thebrake-blocks A2,asshown in Figs. l to 3, but is connected with and pivoted to the rod D2,while the rod Ciis attached to the block A2 and the rod D2. 'Ihe act-ionof the brakeblock B2 on the rod G2 is substantially the same as thatexplained with reference to Figs. 1,3.

In the modification shown in Fig. 5 the intermediary rod C2 exertsadditional pressure on the block A2, thus increasing the effect,

`The brake may be made to act by a brake` spindle, or an adjustablelever and block B2 will be applied in a degree corresponding to theadjustment of A?.

It will be obvious from the drawings that one operatinggear and onelever or spindle suiiice to cause partial or entire application of thebrake.

In the modification shown in Figs. 5 and 5 the brakeblock A2 is made toact from below the chain, and other parts being arranged to suit themotion of the wheel in the direction of the arrow.

I claim- 1. In a car-brake, the combination, with a swinging brake-blockarranged to bear on the periphery of one of the wheels at one side, of agravity-block arranged to bear on the periphery of said wheel at theopposite side, the pivoted supporting-rod C, for said gravital block, aconnecting-rod for connecting thelatter with the swinging block, anddevices such as described forlowering and raising the gravital block,substantially as and for the purpose specified.

2. In a car-brake, the combination, with a swinging brake-block arrangedto bear on the periphery of one of the wheels at one side, a gravitalblock arranged to bear on the periphery of said wheel at the oppositeside, a pivoted support for said gravital block, a connecting-rod forconnecting the latter block with the swinging block, and devices such asdescribed for lowering and raising the gravital block, of the lever Z,connected with the swinging block, the bell-crank lever m and n, andappliances for actuating said bell-crank lever, substantially as and forthe purpose specified.

Y 3. In a car-brake, the combination, with a swinging brake-blockarranged to bear on the periphery of one of the wheels on one sidethereof, a gravital block arranged to bear upon the periphery of saidwheel at the opposite V side, and a pivoted support for the latterblock, of a connecting-rod connected at one end to the swinging blockand at the other to the pivot for the support of the gravital block, anddevices, substantially such as described, vfor lowering and raising thegravital block, substantially asand for the purpose specified.

In testimony that I claim the foregoing as my invention I have signedmy' name in presence of two subscribing witnesses.

ALEX. SCHOLZE, B. Bor.

IOO

